[split] Stolfi's Core-mantle-crust model

[Koen G]

Hi Marco
I must admit that the paradigm does work if you consider all legal word forms. In fact, "curve" glyphs before gallows are more common than I thought. 
Even gallows at the ends of words are more common than I thought. And they are somewhat consistent, with words like [chok] and [qot] appearing multiple times.